Kasimierz as a Baby Name. Meaning and Origin of Kasimierz

What is the meaning of the name Kasimierz ?

The baby name Kasimierz is a Male name , 3 syllables long and is pronounced /kaˈɕimjɛʂ/ (Polish); approx. "kah‑SHEE‑myesh".

Kasimierz is Polish in Origin.

A rare modern variant of Kazimierz, Kasimierz derives from the Slavic name borne by Polish and Lithuanian nobility and saints. It traces to the elements kaz- (linked to kazać, “to declare/command,” or kaziti, “to destroy”) and mir (“peace, world”), yielding traditional readings such as “proclaimer of peace” or the older, less favored “destroyer of peace.”

Used chiefly in Poland and neighboring regions since the Middle Ages, the name gained prestige through kings like Kazimierz I the Restorer and Kazimierz III the Great, and especially Saint Casimir; his feast on March 4 shaped its onomastic calendar. Variants include Kazimierz (standard Polish), Casimir (English/French), Kasimir (German), Casimiro (Spanish/Italian/Portuguese), Kazimír (Czech/Slovak), Kazimieras (Lithuanian), Kázmér (Hungarian), Kazimir (Russian/Ukrainian/Belarusian), and Cazimir (Romanian); feminine forms are Kazimiera and Casimira. Common diminutives are Kazik, Kazio/Kaziu, and Kazek, with modern “Kaz” also seen.

⚙ Kasimierz is absent from every birth registry and name dataset we follow. Names like this are usually very rare, tied to a particular region or tradition, or freshly invented. Whatever the reason, hardly anyone else has it.